Automatic tracking of geolocation data for exercises

ABSTRACT

Techniques for automatic tracking of user data for exercises are disclosed. In one aspect, a method of operating a wearable device may involve determining, based on output of one or more biometric sensors, that a user of the wearable device has started an exercise and identifying a type of the exercise that the user has started based on comparing the output of the one or more biometric sensors to defined sensor data for a plurality of exercise types. The method may further include adjusting a global positioning system (GPS) receiver in response to determining the start of the exercise and based on the type of the exercise.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of application Ser. No. 15/159,738,filed May 19, 2016, which is hereby incorporated by reference in itsentirety.

TECHNICAL FIELD

This disclosure relates to the field of wearable devices, andparticularly to automatic tracking of geolocation data for exercises.

BACKGROUND

Consumer interest in personal health has led to a variety of personalhealth monitoring devices being offered on the market. Such devices,until recently, tended to be complicated to use and were typicallydesigned for use with one activity, for example, bicycle trip computers.

Advances in sensors, electronics, and power source miniaturization haveallowed the size of personal health monitoring devices, also referred toherein as “biometric tracking,” “biometric monitoring,” or simply“wearable” devices, to be offered in extremely small sizes that werepreviously impractical. The number of applications for these devices isincreasing as the processing power and component miniaturization forwearable devices improves.

In addition, wearable devices may be used for the tracking ofgeolocation data, for example via a global positioning system (GPS)receiver. One application for the tracking of geolocation data is thelogging of the route of an exercise performed by a user. The logging ofgeolocation data may require the GPS receiver to receive data from aplurality of GPS satellites.

SUMMARY

The systems, methods and devices of this disclosure each have severalinnovative aspects, no single one of which is solely responsible for thedesirable attributes disclosed herein.

In one aspect, there is provided a method of operating a wearabledevice, the wearable device comprising one or more biometric sensors anda global positioning system (GPS) receiver. The method may involve:determining, based on output of the one or more biometric sensors, thata user of the wearable device has started an exercise; identifying atype of the exercise that the user has started based on comparing theoutput of the one or more biometric sensors to defined sensor data for aplurality of exercise types; and adjusting the GPS receiver in responseto determining the start of the exercise and based on the type of theexercise.

In another aspect, there is provided a wearable device, including one ormore biometric sensors, a GPS receiver; and at least one processorcoupled to the one or more biometric sensors and the GPS receiver. Thewearable device may further include a memory storing computer-executableinstructions for controlling the at least one processor to: determine,based on output of the one or more biometric sensors, that a user of thewearable device has started an exercise; identify a type of the exercisethat the user has started based on comparing the output of the one ormore biometric sensors to defined sensor data for a plurality ofexercise types; and adjust the GPS receiver in response to determiningthe start of the exercise and based on the type of the exercise.

In yet another aspect, there is provided a non-transitory computerreadable storage medium having stored thereon instructions that, whenexecuted, cause a processor of a wearable device to: determine, based onoutput of one or more biometric sensors of the wearable device, that auser of the wearable device has started an exercise; identify a type ofthe exercise that the user has started based on comparing the output ofthe one or more biometric sensors to defined sensor data for a pluralityof exercise types; and adjust a GPS receiver of a mobile device pairedwith the wearable device in response to determining the start of theexercise and based on the type of the exercise.

In still another aspect, there is provided a method of operating awearable device, the wearable device comprising one or more biometricsensors and a GPS receiver. The method may involve: determining, basedon output of the one or more biometric sensors, that a user of thewearable device has started an exercise; identifying a type of theexercise that the user has started based on comparing the output of theone or more biometric sensors to defined sensor data for a plurality ofexercise types; and determining that the output of the one or morebiometric sensors is indicative of the user continuing the exercise forlonger than a defined time period. The method may further involve:classifying the exercise as a discrete exercise in response todetermining that the output of the one or more biometric sensors isindicative of the user continuing the exercise for longer than thedefined time period; and displaying at least one of an indicator andinformation relating to the discrete exercise to the user via aweb-interface or a mobile device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a block diagram illustrating certain components of an examplewearable device in accordance with aspects of this disclosure.

FIG. 1B is a block diagram illustrating example biometric sensors whichmay be in communication with a processor of a wearable device inaccordance with aspects of this disclosure.

FIG. 1C is an example block diagram illustrating a number of geolocationsensors that may be used in determining the location of the wearabledevice in accordance with aspects of this disclosure.

FIG. 1D is an example block diagram of a system used for determiningheart rate in accordance with aspects of this disclosure.

FIG. 2 is an example of a wrist-worn device in accordance with aspectsof this disclosure.

FIG. 3 is a perspective view illustrating another example of awrist-worn device in accordance with aspects of this disclosure.

FIG. 4 is a flowchart illustrating a method for the automatic trackingof geolocation data for exercise(s) in accordance with aspects of thisdisclosure.

FIG. 5 is a flowchart illustrating another method for the automatictracking of geolocation data for exercise(s) in accordance with aspectsof this disclosure.

FIG. 6 is a flowchart illustrating a method for the back-filling ofexercise route(s) in accordance with aspects of this disclosure.

FIG. 7 is a flowchart illustrating another method for the back-fillingof exercise route(s) in accordance with aspects of this disclosure.

FIG. 8 is a block diagram illustrating an example implementation of theback-filling of an exercise route in accordance with aspects of thisdisclosure.

FIG. 9 is a flowchart illustrating another example method for automaticdetection of exercise(s) and tracking of geolocation data in accordancewith aspects of this disclosure.

FIG. 10 is a flowchart illustrating another example method forback-filling of geolocation-based exercise route(s) in accordance withaspects of this disclosure.

DETAILED DESCRIPTION

One of the applications of wearable devices may be the tracking of anexercise performed by a user of a wearable device via at least onebiometric sensor. Various algorithms or techniques for trackingexercises have been developed and these algorithms may be specializedbased on the type of exercise performed by the user. For example, whenthe exercise that a user desires to track is an outdoor run, aspecialized outdoor run algorithm may be performed based on datareceived from a motion sensor, a heart rate monitor, and/or a globalpositioning system (GPS) receiver. However, when the user decides totrack an indoor or treadmill run, data from the GPS receiver may not beneeded since the user will not be moving a sufficient distance for theGPS receiver data to be useful in tracking the exercise. The differentalgorithms for tracking various exercises may include, but are notlimited to, outdoor running, indoor/treadmill running, outdoor biking,indoor/stationary biking, swimming, hiking, etc. Certain embodiments ofthis disclosure may also apply to the GPS tracking of other activities,such as driving (e.g., the tracking of geolocation data while driving ina vehicle) or any activity where GPS geolocation data may be tracked.

Although the techniques of this disclosure may be described inconnection with the tracking of the geolocation of a wearable device viaa GPS receiver, this disclosure is not limited to the use of a GPSreceiver or component(s) thereof. Other geolocation tracking techniquesthat may be used in place of, or in addition to, a GPS receiver mayinclude, for example, tracking location via a wireless wide area network(WWAN) radio circuit/chip or component(s) thereof (e.g., configured forcommunication via one or more cellular networks), via a wireless localarea network (WLAN) radio circuit/chip or component(s) thereof (e.g.,configured for one or more standards, such as the IEEE 802.11 (Wi-Fi)),etc.

In related aspects, each of the GPS receiver, the WLAN radio circuit,and the WLAN radio circuit may be referred to as geolocation sensor. Oneor more geolocation sensors may be implemented as a System-on-Chip(SoC). For example, the SoC may include one or more central processingunit (CPU) cores, a GPS receiver, a WLAN radio circuit, a WWAN radiocircuit, and/or other software and hardware to support the wearabledevice.

In further related aspects, the terms “location” and “geolocation” maybe used interchangeably herein. The terms “location” and “geolocation”generally refer to the real-world geographic location of an object, suchas a wearable device, which may be determined by one or more of theabove-mentioned geolocation tracking techniques.

Geolocation data may be used by certain exercise tracking algorithms tosupplement data received from other biometric sensors of a wearabledevice. For example, during a running exercise, geolocation data that istracked may be: displayed to the user during/after the exercise; used tocalibrate the distance estimations from other biometric sensors of thewearable device; and/or used to determine certain physiological metricsassociated with the running exercise (e.g., calories burned). Thoseskilled in the art will recognize that geolocation data may be used todetermine many other physiological metrics associated with an exercise,including but not limited to altitude, heart rate, heart ratevariability, speed/pace, etc.

It may be desirable for a wearable device to automatically track anexercise and the associated geolocation for the exercise. For example, auser may forget to input the start of an exercise to the wearable deviceand/or may not wish to take the time to input the start of the exercise.Accordingly, the wearable device may be able to automatically detectthat the user has started an exercise based on the output from biometricsensor(s) of the wearable device. However, certain movements and/oractions performed by a user may be similar to movements during anexercise. For example, a user may run to catch a bus, or run on atreadmill indoors. In these situations, the tracking of geolocation maynot be desirable, and thus, turning on or running the GPS sensor (and/orother geolocation sensor(s)) at a high resolution may lead to excess orunnecessary battery usage. Accordingly, certain aspects of the presentdisclosure are directed to techniques for the accurate detection andidentification of exercises for which it is desirable to trackgeolocation data, as well as the adjusting of a GPS receiver (and/orother geolocation sensor(s)) for the exercises.

In accordance with one illustrative example, GPS receivers typicallyrequire an initial GPS fix prior to the tracking of geolocation data.For example, in order to obtain a first positional fix using a GPSreceiver (either a GPS receiver that has never been used before or a GPSreceiver that has been turned off for a long period of time or that hasbeen moved a large distance while turned off), the GPS receiver mayspend a large amount of time, e.g., 12.5 minutes, downloading a GPSalmanac from one or more of the GPS satellites within range. The 12.5minute download duration is a limitation of the GPS satellitetransmitter bandwidth (e.g., 50 bits per second). As discussed below,there are certain techniques which may be used to reduce the requiredtime to reach the first positional fix, however, these techniques mayrequire additional energy, thereby consuming battery life of thewearable device and/or still involve some delay before the initial GPSfix. Due to this time required to obtain a first positional fix, if theGPS receiver has not been turned on prior to the start of an exercise,the GPS geolocation data may not be available for an initial time periodof the exercise. Accordingly, the GPS geolocation data may begin withgeolocation data approximately 12.5 minutes after (or at a time that iswell after) the user has started the exercise.

The time to obtain the first positional GPS fix (time-to-first-fix, orTTFF) may be shortened dependent on a number of factors, including thestart state of the GPS receiver. A GPS receiver may perform a “hotstart,” a “warm start,” and a “cold start.” With a hot start, the GPSreceiver may remember or store its last calculated position, which GPSsatellites were in view of the receiver, the almanac that was used, andthe coordinated universal time (UTC) from the last time it was poweredon, and may, using such existing information, have a TTFF on the orderof a few seconds, e.g., 1 to 5 seconds. With a warm start, the GPSreceiver may remember its last calculated position, almanac used, andUTC, but not which satellites were in view. A GPS receiver performing awarm start may achieve a TTFF on the order of less than a minute. With acold start, the GPS receiver must re-download the entire almanac from aGPS satellite, which may take on the order of 12-15 minutes. The startstate may depend on how far the GPS receiver moved since the lastpositional fix was obtained, as well as on how long it has been sincethe most recent positional fix. The almanac data and ephemeris data maybe updated periodically to adjust for orbital drift and other factors,so any such data that has been downloaded to a GPS receiver must bere-downloaded if sufficient time has passed. Ephemeris data typicallyhas a shelf life of about 4 hours, and is usually updated every 2 hours;almanac data is typically refreshed every 24 hours.

The lack of initial GPS geolocation data may be particularly pronouncedfor the automatic tracking of exercises or for exercises where the userdoes not wait for a GPS fix. When a user manually starts the tracking ofan exercise, there may be sufficient time to notify the user that aninitial GPS positional fix is not yet available or to obtain the GPS fixbetween the time the user indicates that they will be performing anexercise and the start of the exercise. However, the automatic trackingof an exercise, e.g., the detection of the user performing an exerciseby the wearable device without user interaction, may occur a period oftime after the user has started the exercise, and thus, there may not besufficient time to obtain an initial GPS position fix. This may lead tothe loss of positional or geolocation data for a period of time afterthe start of the exercise. Certain aspects of this disclosure relate totechniques for obtaining location or position data between the start ofan exercise and the initial GPS position fix. The user may not wish towait for the initial GPS fix before starting an exercise. Accordingly, aportion of the exercise may not have associated GPS geolocation dataavailable.

Wearable Device Overview

FIG. 1A is a block diagram illustrating an example wearable device inaccordance with aspects of this disclosure. The wearable device 100 mayinclude a processor 120, a memory 130, a wireless transceiver 140, andone or more biometric sensor(s) 160. The wearable device 100 may alsooptionally include a user interface 110 and one or more environmentalsensor(s) 150. The wireless transceiver 140 may be configured towirelessly communicate with a client device 170 and/or server 175, forexample, either directly or when in range of a wireless access point(not illustrated) (e.g., via a personal area network (PAN) such asBluetooth pairing, via a WLAN, etc.). Each of the memory 130, thewireless transceiver 140, the one or more biometric sensor(s) 160, theuser interface 110, and/or the one or more environmental sensor(s) 150may be in electrical communication with the processor 120.

The memory 130 may store instructions for causing the processor 120 toperform certain actions. For example, the processor 120 may beconfigured to automatically detect the start of an exercise performed bya user of the wearable device 100 and adjust a GPS receiver based oninstructions stored in the memory 130. The processor 120 may receiveinput from the one or more of the biometric sensor(s) 160 and/or the oneor more environmental sensor(s) 150 in order to determine or back-fill aroute of the user during a first interval between the start of anexercise and a time at which a GPS receiver achieves an initial fix ofthe location of the wearable device after the start of the exercise. Insome embodiments, the biometric sensors 160 may include one or more ofan optical sensor (e.g., a photoplethysmographic (PPG) sensor), anaccelerometer, a GPS receiver, and/or other biometric sensor(s). Furtherinformation regarding such biometric sensors are described in moredetail below (e.g., in connection with FIG. 1B).

The wearable device 100 may collect one or more types of physiologicaland/or environmental data from the one or more biometric sensor(s) 160,the one or more environmental sensor(s) 150, and/or external devices andcommunicate or relay such information to other devices (e.g., the clientdevice 170 and/or the server 175), thus permitting the collected data tobe viewed, for example, using a web browser or network-basedapplication. For example, while being worn by the user, the wearabledevice 100 may perform biometric monitoring via calculating and storingthe user's step count using the one or more biometric sensor(s) 160. Thewearable device 100 may transmit data representative of the user's stepcount to an account on a web service (e.g., www.fitbit.com), computer,mobile phone, and/or health station where the data may be stored,processed, and/or visualized by the user. The wearable device 100 maymeasure or calculate other physiological metric(s) in addition to, or inplace of, the user's step count. Such physiological metric(s) mayinclude, but are not limited to: energy expenditure, e.g., calorie burn;floors climbed and/or descended; heart rate; heartbeat waveform; heartrate variability; heart rate recovery; location and/or heading (e.g.,via a GPS, global navigation satellite system (GLONASS), or a similarsystem); elevation; ambulatory speed and/or distance traveled; swimminglap count; swimming stroke type and count detected; bicycle distanceand/or speed; blood pressure; blood glucose; skin conduction; skinand/or body temperature; muscle state measured via electromyography;brain activity as measured by electroencephalography; weight; body fat;caloric intake; nutritional intake from food; medication intake; sleepperiods (e.g., clock time, sleep phases, sleep quality and/or duration);pH levels; hydration levels; respiration rate; and/or otherphysiological metrics.

The wearable device 100 may also measure or calculate metrics related tothe environment around the user (e.g., with the one or moreenvironmental sensor(s) 150), such as, for example, barometric pressure,weather conditions (e.g., temperature, humidity, pollen count, airquality, rain/snow conditions, wind speed), light exposure (e.g.,ambient light, ultra-violet (UV) light exposure, time and/or durationspent in darkness), noise exposure, radiation exposure, and/or magneticfield. Furthermore, the wearable device 100 (and/or the client device170 and/or the server 175) may collect data from the biometric sensor(s)160 and/or the environmental sensor(s) 150, and may calculate metricsderived from such data. For example, the wearable device 100 (and/or theclient device 170 and/or the server 175) may calculate the user's stressor relaxation levels based on a combination of heart rate variability,skin conduction, noise pollution, and/or sleep quality. In anotherexample, the wearable device 100 (and/or the client device 170 and/orthe server 175) may determine the efficacy of a medical intervention,for example, medication, based on a combination of data relating tomedication intake, sleep, and/or activity. In yet another example, thewearable device 100 (and/or the client device 170 and/or the server 22)may determine the efficacy of an allergy medication based on acombination of data relating to pollen levels, medication intake, sleepand/or activity. These examples are provided for illustration only andare not intended to be limiting or exhaustive.

FIG. 1B is a block diagram illustrating a number of example biometricsensors that may be in communication with the processor of the wearabledevice in accordance with aspects of this disclosure. For example, inthe embodiment of FIG. 1B, the wearable device 100 may include a GPSreceiver 166 which may be used to determine the geolocation of thewearable device 100. The wearable device 100 may further includeoptional geolocation sensor(s) 167 (e.g., WWAN and/or WLAN radiocomponent(s)), in addition to or in lieu of the GPS receiver 166. Thewearable device 100 may further include optional optical sensor(s) 168(e.g., a PPG sensor), and may optionally include an accelerometer 162(e.g., a step counter), direction sensor(s) 163, and/or other biometricsensor(s) 164. Examples of the directional sensor(s) include theaccelerometer 162, gyroscopes, magnetometers, etc. Each of the biometricsensors illustrated in FIG. 1B is in electrical communication with theprocessor 120. The processor 120 may use input received from anycombination of the GPS receiver 166, the optical sensor(s) 168, theaccelerometer 162, and/or the other biometric sensor(s) 164 in detectingthe start of an exercise and/or in tracking the exercise. In someembodiments, the GPS receiver 166, the optical sensor(s) 168, theaccelerometer 162, and/or the other biometric sensor(s) 164 maycorrespond to the biometric sensor(s) 160 illustrated in FIG. 1A.

Additionally, in some implementations, the GPS receiver 166 and/or othergeolocation sensor(s) 167 may be located in the client device 170 ratherthan the wearable device 100. In these implementations, the processor120 may wirelessly communicate with the client device 170 to controland/or receive geolocation data from the GPS receiver 166 and/or theother geolocation sensor(s) 167.

It related aspects, the processor 120 and other component(s) of thewearable device 100 (e.g., shown in FIGS. 1A and 1B) may be implementedas any of a variety of suitable circuitry, such as one or moremicroprocessors, application specific integrated circuits (ASICs), fieldprogrammable gate arrays (FPGAs), discrete logic, software, hardware,firmware or any combinations thereof. When the techniques areimplemented partially in software, a device may store instructions forthe software in a suitable, non-transitory computer-readable medium andexecute the instructions in hardware using one or more processors toperform the techniques of this disclosure.

In further related aspects, the processor 120 and other component(s) ofthe wearable device 100 may be implemented as a SoC that may include oneor more CPU cores that use one or more reduced instruction set computing(RISC) instruction sets, a GPS receiver 166, a WWAN radio circuit, aWLAN radio circuit, and/or other software and hardware to support thewearable device 100.

FIG. 1C is an example block diagram illustrating geolocation sensor(s)that may be used in determining the location of the wearable device inaccordance with aspects of this disclosure. As shown in FIG. 1C, a useris wearing a wearable device 100 and is carrying a client device 170. Agiven geolocation sensor (e.g., the GPS receiver 166) of the wearabledevice 100 and/or the client device 170 may receive geolocation datafrom a GPS satellite 181. Although only one GPS satellite 181 isillustrated in FIG. 1C, the geolocation sensor may receive data from aplurality of GPS satellites at one time, typically three or more GPSsatellites.

The geolocation sensor(s) (e.g., WWAN and/or WLAN radio component(s) inthe wearable device 100 and/or the client device 170) may also receivegeolocation data from a cellular base station 183 and/or a Wi-Fi router185. Those skilled in the art will recognize that the geolocationsensor(s) may be able to determine the location of the wearable device100 based on information received from the cellular base station 183and/or the Wi-Fi router 185. For example, the cellular base station 183may include geolocation data in the communications with the wearabledevice 100 and/or the client device 170 or may provide the wearabledevice 100 and/or the client device 170 with a unique identifier thatidentifies the cellular base station 183. Thus, a given geolocationsensor may be able to determine the location of the cellular basestation 183 based on the unique identifier and retrieve thecorresponding location from a memory 130 or from a server 175 (which maybe connected to the wearable device 100 and/or the client device 170 viathe Internet). The geolocation sensor may also be able to infer thedistance of the wearable device 100 from the cellular base station 183based on the strength of the signal received therefrom. The geolocationsensor may also be able to estimate the location of the wearable device100 based on triangulation techniques with three or more cellular basestations 183.

The geolocation sensor(s) may also be able to determine the location ofthe wearable device 100 based on data received from the Wi-Fi router185. The determination of the location of the wearable device 100 basedon the data from the Wi-Fi router 185 may be similar to the techniquesused for determining location based on the data received from thecellular base station 183. For example, a given geolocation sensor mayreceive a unique identifier (e.g., an Internet Protocol (IP) address,Service Set Identifier (SSID), etc.) from the Wi-Fi router which fromwhich the geolocation sensor may look up the location of the Wi-Firouter. Additionally, the geolocation sensor may refine the geolocationdata received from the Wi-Fi router based on the strength of thereceived Wi-Fi signal, which may be related to the distance of thewearable device 100 from the Wi-Fi router.

In related aspects, the processor(s) 120 of the wearable device 100(and/or the processor(s) on the client device 170 paired with thewearable device 100) may determine the determine the availability andreliability of geolocation data from the GPS receiver 166 and/or theother geolocation sensor(s) 167, and select a subset or portion of thegeolocation data to use in determining the geolocation of the wearabledevice 100. In further related aspects, the processor(s) 120 of thewearable device 100 (and/or the processor(s) on the client device 170)may aggregate the geolocation data from GPS receiver 166 and/or theother geolocation sensor(s) 167, and may determine the geolocation ofthe wearable device 100 based on the aggregated geolocation data.

Measuring Heart Rate and/or Heart Rate Variability

FIG. 1D is an example block diagram of a system used for determiningheart rate in accordance with aspects of this disclosure. As shown inFIG. 1D, the wearable device 10 may include a system 190 of circuitcomponents for determining the heart rate of the user based on anoptical PPG signal (e.g., received from the optical sensor 168) and amotion signature (e.g., received from the accelerometer 162). As usedherein, a motion signature may refer to any biometric signature orsignal that may be received from and/or based on output data from one ormore of the biometric sensor(s) 160 which may be indicative of theactivity and/or physiological state of a user of the wearable device100. The system 190 may be implemented by hardware components and/or insoftware executed by the processor 120. The system 190 may include firstand second spectra estimators 191 and 192, a multi-spectra tracker 193,an activity identifier or discriminator 194, and a track selector 195.Each of the first and second spectra estimators 191 and 192 may includea Fast Fourier Transform (FFT) block and a peak extraction block. In theexample of FIG. 1D, the activity identifier 194 may use the peaksextracted from the motion signature to determine the activity that theuser is performing (e.g., sedentary, walking, running, sleeping, lyingdown, sitting, biking, typing, elliptical, weight training, etc.). Thisdetermination of the current activity of the user may be used by themulti-spectra tracker 193 and the track selector 195 in extracting theheart rate from the optical PPG signal. Thus, the motion signature inFIG. 1D may be used by the system 190 to determine the current activityof the user. In other embodiments, the processor 120 may use a similartechnique to the activity identifier 194 in determining the type of anexercise, as discussed in greater detail below.

The blocks illustrated in FIG. 1D are merely examples of componentsand/or processing modules that may be performed to supplement a PPGsignal with a motion signature to determine heart rate. However, inother implementations, the system 190 may include other blocks or mayinclude input from other biometric sensors of the wearable device 100.

Under certain operating conditions, the heart rate of the user may bemeasured by counting the number of signal peaks within a time window orby utilizing the fundamental frequency or second harmonic of the signal(e.g., via an FFT). In other cases, such as heart rate data acquiredwhile the user is in motion, FFTs may be performed on the signal andspectral peaks extracted, which may then be subsequently processed by amultiple-target tracker which starts, continues, merges, and/or deletestracks of the spectra.

In some embodiments, a similar set of operations may be performed on themotion signature and the output may be used to perform activitydiscrimination which may be used to assist the multi-spectra tracker193. For instance, it may be determined that the user was stationary andhas begun to move. This information may be used to by the multi-spectratracker 193 to bias the track continuation toward increasingfrequencies. Similarly, the activity identifier 194 may determine thatthe user has stopped running or is running slower and this informationmay be used to preferentially bias the track continuation towarddecreasing frequencies.

Tracking may be performed by the multi-spectra tracker 193 withsingle-scan or multi-scan, multiple-target tracker topologies such asjoint probabilistic data association trackers, multiple-hypothesistracking, nearest neighbor, etc. Estimation and prediction in thetracker may be done through Kalman filters, spline regression, particlefilters, interacting multiple model filters, etc.

The track selector 195 may use the output tracks from themultiple-spectra tracker 193 and estimate the user's heart rate based onthe output tracks. The track selector 195 may estimate a probability foreach of the tracks that the corresponding track is representative of theuser's heart rate. The estimate may be taken as the track having themaximum probability of being representative of the user's heart rate, asum of the tracks respectively weighted by their probabilities of beingrepresentative of the user's the heart rate, etc. The activityidentifier 194 may determine a current activity being performed by theuser which may be used by the track selector 195 in estimating theuser's heart rate. For instance, when the user is sleeping, sitting,lying down, or sedentary, the user's estimated heart rate may be skewedtoward heart rates in the 40-80 bpm range. When the user is running,jogging, or doing other vigorous exercise, the user's estimated heartrate may be skewed toward elevated heart rates in the 90-180 bpm range.The activity identifier 194 may determine the user's current activity(e.g., a current exercise) based at least in part on the speed of theuser. The user's estimated heart rate may be shifted toward (or whollyobtained by) the fundamental frequency of the selected output track whenthe user is not moving. The output track that corresponds to the user'sheart rate may be selected by the track selector 195 based on criteriathat are indicative of changes in activity. For instance, when the userbegins to walk from being stationary, the track selector 195 may selectthe output track that illustrates a shift toward higher frequency basedon output received from the activity discriminator 194.

The wearable device 100 according to embodiments and implementationsdescribed herein may have a shape and/or size adapted for coupling to(e.g., secured to, worn, borne by, etc.) the body or clothing of a user.FIG. 2 shows an example of a wrist-worn wearable device 202 inaccordance with aspects of this disclosure. The wrist-worn wearabledevice 202 may have a display 205, button(s) 204, electronics package(not illustrated), and/or an attachment band 206. The attachment band206 may be secured to the user through the use of hooks and loops (e.g.,Velcro), a clasp, and/or a band having memory of its shape, for example,through the use of a spring metal band.

FIG. 3 is a perspective view illustrating another example of awrist-worn device in accordance with aspects of this disclosure. Thewrist-worn wearable device 302 of FIG. 3 may include button(s) 304, anattachment band 306, fasteners 308 (e.g., hook and loops, clasps, orband shape memory), a device housing 310, a sensor protrusion 312,and/or a charging/mating recess 314 (e.g., for mating with a charger ordata transfer interface of a cable, etc.). In contrast to the wrist-wornwearable device 202 of FIG. 2, in FIG. 3, the wrist-worn wearable device302 includes the sensor protrusion 312 and the recess 314 for matingwith a charger and/or data transmission cable. FIG. 3 also illustratesthe device housing 310 which may house internals of the wrist-wornwearable device 302 such as, for example, the processor 120, the GPSreceiver 166, the optical sensor(s) 168, and/or the accelerometer 162.The optical sensor(s) 168 may be housed directly below the sensorprotrusion 312.

Automatic Detection of Exercise(s)

Certain aspects of this disclosure relate to the automatic tracking ofexercises, including the tracking of geolocation data. As describedabove, one application for a wearable device, such as the wearabledevice 100, is the tracking of exercises performed by a user of thewearable device 100. While a user may manually start and/or end thetracking of an exercise, which may involve the selection of the type ofthe exercise to be performed, along with the optional selection of goalssuch as a target heart rate, distance, exercise time period, etc., thetechniques described herein may allow a user to start and/or end anexercise without manual input or interaction with the wearable device100, and the wearable device 100 may be able to automatically startand/or stop the tracking of the exercise. This may allow the user toskip the input of start and/or end of the exercise and/or the otherparameters and still have the exercise be tracked by the wearable device100. Further, the described techniques may allow a user to have theirexercise(s) tracked even when the user forgets to input an indication ofthe start and/or end of an exercise to the wearable device 100.

The tracking of geolocation data using a GPS receiver (such as GPSreceiver 166) may be useful for exercises such as biking and running.The tracking of these exercises may involve the user manually indicatingthe start of an exercise by pressing a start button of a wearable device100 or a connected client device 170 and indicating the end of theexercise by pressing a stop button of the wearable or client device 100or 170. Data logged during this period, such as the data received fromthe GPS receiver 166 or various biometric sensors 160, may be used by aprocessor 120 of the wearable device 100 to provide feedback to theuser. Certain aspect of this disclosure relate to the automateddetection and logging of data relating to the start and/or end of theexercise without any manual intervention.

FIG. 4 is a flowchart illustrating a method for the automatic trackingof geolocation data for exercise(s) in accordance with aspects of thisdisclosure. The method 400 may be operable by a wearable device 100, orcomponent(s) thereof, for automatic detection of exercises in accordancewith aspects of this disclosure. For example, the steps of method 400illustrated in FIG. 4 may be performed by a processor 120 of thewearable device 100. In another example, a client device 170 (e.g., amobile phone) or a server 175 in communication with the wearable device100 may perform at least some of the steps of the method 400. Forconvenience, the method 400 is described as performed by the processor120 of the wearable device 100.

The method 400 starts at block 401. At decision block 405, the processor120 detects whether or not the start of an exercise has occurred. Whenthe processor 120 detects the start of an exercise, the method 400proceeds to block 410. When the processor 120 does not detect the startof an exercise, the method 400 remains at block 405, where the processor120 may routinely, or at defined intervals, determine whether the startof an exercise has been detected.

The processor 120 may detect the start of an exercise based on inputreceived from one or more of the biometric sensor(s) 160. Furthermore,the biometric sensor(s) 160 used in the detection of the start of anexercise may be based on the type of exercise to be detected. Forexample, a running exercise may be detected based on data received froman accelerometer 162. In one implementation, the processor 120 analyzesstep data that is generated based on the data output from theaccelerometer 162 to determine whether the user of the wearable device100 has started a running exercise. Depending on the implementation, thedetection of a running exercise may include one or more of: comparing astep rate to a defined step rate threshold, where a step rate greaterthan the defined step rate threshold is indicative of the userperforming a running exercise; comparing the peak accelerations of theaccelerometer 162 to a defined peak acceleration threshold, where peakaccelerations greater than the defined peak acceleration threshold isindicative of the user performing a running exercise (e.g., usermovement characteristic of running may produce larger forces than usermovement characteristic of walking or other exercises); and determiningwhether the data output from the accelerometer 162 matches or is withina threshold range (e.g., defined tolerated difference range) of a motionsignature associated with running.

In another implementation, the processor 120 may detect the start of abiking exercise based on data received from the GPS receiver 166. Inthis implementation, the processor 120 may initially run the GPSreceiver 166 at a duty cycle that is less than a threshold duty cycle(e.g., a non-zero resolution that is lower than a threshold resolution).Based on the data output from the GPS receiver 166, the processor 120may then determine that the user is performing a biking exercise whenthe location of the GPS receiver 166 is changing at a rate that isgreater than a location rate-change threshold. The processor 120 mayalso base the determination that the user is performing a bikingexercise based on a determination of whether data output from one ormore of the biometric sensor(s) 160 is within a threshold differencefrom motion signature(s) associated with biking. In some embodiments,the processor 120 may also detect the start of a running exercise basedon data received from the GPS receiver 166, similar to the manner inwhich data from the GPS receiver 166 may be used to detect the start ofa biking exercise as described above. In some embodiments, the processor120 may detect the start of various exercises (e.g., running, biking,etc.) based on output of a heart rate sensor (e.g., optional opticalsensor(s) 168, such as a PPG sensor). For example, data corresponding toan elevated heart rate may indicate that the user has startedexercising.

While the detection of running and biking exercises have been given asexamples above, this disclosure may also be applied to other forms ofexercise (e.g., swimming, hiking, etc.) by applying similar techniquesto data received from one or more biometric sensor(s) 160 that areconsistent with the types of exercises that may be detected.

After the processor 120 has detected the start of an exercise, themethod 400 continues at block 410, where the processor 120, and/or aprocessor or the client device 170, adjusts the GPS receiver 166 (and/orother geolocation sensor(s) 167). For example, the processor 120 mayturn on and/or increase the temporal resolution (hereinafter alsoreferred to simply as a resolution) of the GPS receiver 166. Theresolution of the GPS receiver 166 may generally refer to the rate atwhich distinct GPS location measurements are determined. That is, ahigher GPS receiver 166 resolution may include a greater number ofgeolocation data points per unit of time than a lower GPS receiver 166resolution. For example, if the GPS receiver 166 is turned off, theprocessor 120, and/or a processor or the client device 170, may turn onthe GPS receiver 166 to initiate the tracking of the location of the GPSreceiver 166. In implementations where the GPS receiver 166 is run at aduty cycle that is less than a threshold duty cycle during block 405, atblock 410 the processor 120, and/or a processor or the client device170, may instruct the GPS receiver 166 to increase its resolution (e.g.,duty cycle) in order to increase the rate at which geolocation data isoutput from the GPS receiver 166. Block 410 may also involve the loggingof data produced by one or more of the biometric sensor(s) 160 over thecourse of the exercise.

Block 410 may also involve the processor 120 turning on additionalalgorithms that process data output from one or more of the biometricsensor(s) 160. The algorithms that are turned on may be based on thetype of exercise that the user is performing. For example, when the useris performing a running exercise, the processor 120 may initiate analgorithm for smoothing the pace and/or distance metrics estimated bythe processor 120 based on the output of one or more of the biometricsensor(s) 160. In another example, when the user is performing a bikingexercise, the processor 120 may initiate algorithms related to thebiking exercise, such as an algorithm for smoothing the distance and/orcadence metrics estimated by the processor 120. The algorithms forsmoothing pace and/or distance may be turned on at the same time asturning on or increasing the resolution of the GPS receiver 166. Inanother implementation, the algorithms may relate to at least one of:heart rate estimation, higher resolution heart rate estimation, calorieestimation, distance estimation, pace estimation, and cadence estimation(e.g., where a specific version of each algorithm optimized for a givenexercise type may be selected based on the type of the detectedexercise).

At decision block 415, the processor 120 detects whether or not the endof the exercise has occurred. When the processor 120 detects the end ofthe exercise, the method 400 proceeds to block 420. When the processor120 does not detect the end of the exercise, the method 400 remains atblock 410, where the processor 120 may routinely, or at definedintervals, determine whether the end of the exercise has been detected.

The processor 120 may detect the end of the exercise based on inputreceived from the one or more of the biometric sensor(s) 160. Forexample, the processor 120 may determine that the user has ended theexercise when the output received from the one or more biometricsensor(s) 160 no longer matches motion signatures which are consistentwith the type of the exercise. Additionally or alternatively, theprocessor 120 may determine that the user has ended the exercise whenthe geolocation data received from the GPS receiver 166 is indicative ofthe user being substantially stationary (e.g., moving at a rate that isless than expected for the type of the exercise) for a period of timethat is greater than a defined time period.

After the processor 120 has detected the end of the exercise, the method400 may involve the processor 120, and/or a processor or the clientdevice 170, adjusting the GPS receiver. For example, the processor 120may turn off and/or decrease the resolution of the GPS receiver 166.Accordingly, the GPS receiver 166 may no longer log geolocation data ormay log geolocation data at a reduced rate. The method ends at block425.

Although the detection of running and biking by the processor 120 havebeen described as independent implementations, in certainimplementations the detection processes may be run in parallel or asingle detection process may be run which may be used to determine thatdata received from one or more of the biometric sensor(s) 160 isconsistent with the user performing an exercise. The processor 120 mayidentify the type of the exercise based on whether the data receivedfrom one or more of the biometric sensor(s) 160 is within a thresholdrange of motion signatures associated with the different types ofexercises.

Another implementation of the automatic detection of exercises will nowbe described in connection with FIG. 5. FIG. 5 is a flowchartillustrating another method for the automatic tracking of geolocationdata for exercise(s) in accordance with aspects of this disclosure. Themethod 500 may be operable by a wearable device 100, or component(s)thereof, for automatic detection of exercises in accordance with aspectsof this disclosure. For example, the steps of method 500 illustrated inFIG. 5 may be performed by a processor 120 of the wearable device 100.In another example, a client device 170 (e.g., a mobile phone) or aserver 175 in communication with the wearable device 100 may perform atleast some of the steps of the method 500. For convenience, the method500 is described as performed by the processor 120 of the wearabledevice 100.

The method 500 starts at block 501. At decision block 505, the processor120 detects whether or not the start of an exercise has occurred. Whenthe processor 120 has detected the start of an exercise, the method 500proceeds to at least one of blocks 510 and 515. When the processor 120has not detected the start of an exercise, the method 500 remains atdecision block 505, where the processor 120 may routinely, or at definedintervals, determine whether the start of an exercise has been detected.The details of how the processor 120 may detect the start of an exerciseare described above in connection with FIG. 4, and thus, some of thedetails regarding the detection of the start of an exercise will not berepeated below.

After the processor 120 has detected the start of an exercise, themethod 500 may continue at block 510, where the processor adjusts theGPS receiver 166. For example, the processor 120 may turn on and/orincrease the resolution of the GPS receiver 166. For example, if the GPSreceiver 166 is turned off, the processor 120 may turn on the GPSreceiver to initiate the tracking of the location of the GPS receiver166. Once the GPS receiver 166 has been turned on or has an increasedresolution, the processor 120 may log GPS geolocation data received fromthe GPS receiver 166. As discussed above, the GPS receiver may belocated in the wearable device 100 and/or the client device 170 that ispaired with the wearable device 100, and thus, the processor 120 (and/ora processor of the client device 170) may control the logging of datareceived from the GPS receiver 166 (and/or other geolocation sensor(s)167) regardless of the location of the GPS receiver 166.

After, prior to, or concurrently with block 510, the method 500 may, atblock 515, involve the processor 120 identifying the type of theexercise based on output received from one or more of the biometricsensor(s) 160. For example, the processor 120 may compare the outputreceived from one or more of the biometric sensor(s) 160 to definedsensor data for a plurality of exercise types. For example, the definedsensor data may include motion signatures that are associated with thedefined types of exercises. The processor 120 may select the type ofexercise for which the associated motion signature is closest to theoutput received from the one or more biometric sensor(s) 160. In certainimplementations, the processor 120 may only select a type of exercisewhen the output received from the one or more biometric sensor(s) 160 iswithin a defined tolerance range of the associated motion signature.

In certain implementations, the processor 120 may turn on/increase theresolution of the GPS receiver (e.g., performed at block 510) based onthe start of the exercise (e.g., detected at block 505) and theidentified type of the exercise (e.g., identified at block 515). In someimplementations, different exercise types may require differentresolutions. For example, when a user is walking, the user may travel ata lower speed than when the user is biking. As such, the location of thewearable device 100 may not need to be updated at the same resolutionfor walking as for biking. Thus, the resolution at which the processor120 sets the GPS receiver may be based on the identified type of theexercise.

At optional decision block 520, the processor 120 may determine whetherthe time that has elapsed since the start of the exercise is greaterthan a defined time period. When the time since the start of theexercise is not greater than the defined time period, the method 500 maycontinue at one or more of blocks 525, 530, 535, 540, and 545. However,in certain implementations, the method 500 may also continue to one ofblocks 525, 530, 535, 540, and 545 regardless of the amount of time thathas passed since the start of the exercise. When the time since thestart of the exercise is greater than the defined time period, themethod 500 may continue at one of blocks 550 and 555.

At block 525, the processor 120 may calculate a smoothed pace, distance,and/or cadence based on the identified type of exercise. For example,for a running exercise, the processor 120 may calculate a smoothed paceand distance, while for a biking exercise, the processor 120 maycalculate a smoothed distance and cadence (e.g., based on movingaverages, Riemannian manifolds, etc.). In order to calculate thesmoothed metrics, the processor 120 may initiate an algorithm designedto smooth the metrics calculated from the data received from one or moreof the biometric sensor(s) 160 based on the identified type of exercise.

At block 530, the processor 120 may share the GPS geolocation (and orother geolocation data obtained from one or more other geolocationsensors 167) of the wearable device 100 with a third party. For example,the processor 120 may communicate with the third party via a cellularconnection of the wireless transceiver 140 and/or a cellular connectionof the client device 170 that is paired with the wearable device 100.The shared GPS geolocation may be the most recently determined positionof the wearable device 100 and may be shared during the exercise. Bysharing the GPS geolocation with a third party (such as a trusted personselected by the user of the wearable device 100), the wearable device100 may provide a way to monitor the safety of the user of the wearabledevice 100. The geolocation of the user may be a concern for the userwhen the user is performing an exercise in an area/region that isunfamiliar to the user or pose safety risks (e.g., routes near cliffs,rock terrain, constructions zones, poorly lit locations, etc.). The usermay desire that the third party be aware of the user's geolocationshould the user encounter a dangerous situation (e.g., when the user'sgeolocation metrics may be indicative of the exercise beinginadvertently stopped for longer than a defined length of time duringthe exercise, such as when the user may be injured or otherwiseincapacitated). For example, when the output of the GPS receiver 166 isindicative of the user stopping the exercise for more than the definedtime period prior to the end of the exercise, the processor 120 maydetermine that the exercise has been inadvertently stopped. In certainimplementations, the user's geolocation and/or a warning message may besent to the third party when the user's location has not been updatedfor longer than the defined length of time prior to the end of theexercise.

In some implementations, the accelerometer 162 may be used to determinewhether the user has been injured or otherwise incapacitated during theexercise. For example, when the accelerometer 162 detects a sudden stopand/or fall of the user (e.g. the accelerometer data is greater than adefined acceleration threshold), the wearable device 100 may share thegeolocation of the wearable device 100 with the third party. Thewearable device 100 may prompt the user for confirmation of whether theuser has been injured via the user interface 110 in response to theaccelerometer data being greater than the defined accelerationthreshold. When the user confirms that he/she has been injured or doesnot respond to the prompt from the wearable device 100 for longer than apredetermined time period, the wearable device 100 may share thegeolocation of the wearable device 100 with the third party.

At block 535, the processor 120 may estimate the user's heart rateand/or calories burned during the exercise based on the type ofexercise. For example, a calculation used to determine metrics such asthe user's heart rate and/or calories burned may be based on datareceived from one or more of the biometric sensor(s), e.g., the opticalsensor(s) 168 and/or the accelerometer 162. However, the algorithms forcalculating the heart rate and/or calorie metrics may be optimized forcertain types of exercises, and thus, the processor 120 may be able tocalculate these metrics more accurately by running algorithms that areselected based on the identified type of exercise (e.g., higher fidelityalgorithms that are optimized for that exercise type). For example, aversion of a heart rate estimation algorithm optimized for running canbe activated and utilized in response to determining that the user isrunning. As another example, a version of a calorie estimation algorithmoptimized for biking can be activated and utilized in response todetermining that the user is biking. As another example, a version of aheart rate estimation algorithm optimized for lifting weights can beactivated and utilized in response to determining that the user isperforming weight lifting repetitions. In certain implementations, theprocessor 120 may select at least one of the algorithms for calculatingthe heart rate and/or calorie metrics and increase the fidelity of theselected algorithm based on the identified type of the exercise.

At block 540, the processor 120 may turn on or increase the resolutionof one or more of the biometric sensor(s) 160. In one implementation,the processor 120 may increase the resolution of at least one of a heartrate sensor (e.g., the optical sensor 168) and a pulse oxygenationsensor (not illustrated). The higher resolution data (e.g., morefrequent measurements) may be used to generate a detailed summary of theexercise which may be displayed to the user (e.g., via the userinterface 110, a client device 179, and/or an Internet-connecteddevice). The higher resolution data logged during the exercise may alsobe stored in a server 175 for later processing and/or display. A subsetof the one or more biometric sensor(s) 160 for which the resolution isincreased may be based on the identified type of the exercise.

In another implementation, the processor 120 may turn on or increase theresolution of an altimeter (not illustrated). The data logged from thealtimeter may be used in conjunction with the GPS receiver data togenerate a summary of the changes in elevation of the user during theexercise. This data may be displayed to the user in the form of anelevation profile (e.g., graphed with respect to time or distance) ornet elevation gain/loss for the exercise.

At block 545, the processor 120 may display to the user certain metricsrelated to the exercise and/or indicators or information relating to themetrics (e.g., text and/or graphics). Depending on the implementation,the processor 120 may display the metrics via the user interface 110 orthe client device 170. The metrics displayed to the user may include oneor more of: speed/pace, distance, heart rate, calories burned, route,floors climbed, repetitions, heart rate zones, duration of exercise,etc. In one embodiment, the metrics are prepared by the processor 120 tobe displayed to the user (e.g., automatically and without user input) inresponse to the detection of the exercise. In certain implementations,the metrics may not be displayed to the user until the processor 120receives input from the user indicating that the user is ready to viewthe metrics. The input may include one or more actions performed by theuser such as: moving (e.g., rotating and/or lifting) the wearable device100 to a viewing position; tapping the housing or a button of thewearable device 100; touching a touch screen of the user interface 110;and interacting with the client device 170. The processor 120 mayreceive the input via one or more of the user interface 110, theaccelerometer 162, other biometric sensor(s) 164, and the client device170. In related aspects, the processor 120 may direct the wearabledevice 100 to provide to the user an audible message/alert regardingcertain metrics related to the exercise.

In one implementation, the processor 120 may prepare the metric fordisplay to the user in response to the processor 120 determining that aconfidence metric is indicative of the user performing the exercise. Forexample, if the user is running for a short period of time that is notconsistent with an exercise (e.g., the user is running to catch a bus),the confidence metric calculated by the processor 120 may not beindicative of the user performing the exercise. The confidence metricmay be indicative of the user performing the exercise when theconfidence metric is greater than a confidence threshold. The confidencemetric may be determined by the processor 120 based on one or more ofthe duration, speed, pace, and cadence of the detected exercise. Theconfidence metric may be an estimation of the confidence that thedetected exercise is intended by the user to be tracked by the wearabledevice 100. In certain embodiments, the processor 120 may not displayexercise metrics to the user. For example, the processor 120 may notalter the display of the user interface 110 except for the addition of aGPS icon indicating that the GPS receiver 166 is active and thatgeolocation data is being logged. In some embodiments, the loggedlocation data may be used for safety purposes and as a factor forautomatically identifying certain activities based on the loggedlocation (e.g., weight lifting at a gym, various exercises at bootcamp,swimming at a pool, etc.).

At block 550, the processor 120 may classify the exercise as discreet inresponse to the time period since the start of the exercise beinggreater than a defined time period (e.g., the defined time period usedin decision block 520). In one implementation, the defined time periodmay be 10 minutes. The processor 120 may delay displaying metricsregarding the exercise to the user (e.g., block 545) until the exercisehas been classified as discreet. Once the processor 120 has determinedthe exercise to be a discreet exercise, the processor 120 may select anexercise metric to be displayed to the user. The exercise metric may beone or more of a pace, distance, heart rate, calories burned, route,etc. In one implementation, the method 500 proceeds from block 550 toblock 545, where the processor 120 may inform the user that the exercisehas been classified as discreet by providing at least one of visual,audio, and haptic feedback to the user relating to the type of theexercise. In one implementation, the processor 120 may provide thefeedback to the user via determining or selecting an exercise-relatedapplication to be run on the wearable device based on the type of theexercise. The processor 120 may launch the selected exercise-relatedapplication. For example, the exercise-related application may beselected from among: a running exercise tracking application, a cyclingexercise tracking application, etc.

Additionally, once the exercise has been classified as discreet, theprocessor 120 may upload data related to the exercise to a server 175 tobe displayed to the user at a later time, for example, via aweb-interface (e.g., a browser) or mobile dashboard on a mobile device.The data related to the exercise may include geolocation data loggedfrom the GPS receiver 166. The data logged from the GPS receiver 166 maybe used by one or more of the processor 120, the client device 170, andthe server 175 to calculate one or more metrics or provide otherexercise-related information associated with the exercise, such as, forexample, route mapping, distance travelled, time elapsed, pace and/orspeed of the user, absolute and/or change in elevation, calories burned,training/exercise effort, real-time coaching, duration of exercise,higher resolution heart rate data, heart rate zone distributions, musicplay control, etc.

At decision block 555, the processor 120 may determine whether the userhas moved since the detected start of the exercise. In oneimplementation, the processor 120 may determine that the user has movedwhen the distance between a current GPS geolocation and the GPSgeolocation of the initial GPS fix or an estimated geolocation of theuser at the start of the exercise is greater than a distance threshold.For example, when the distance travelled by the user is less than thedistance threshold (e.g., the geolocation of the wearable device 100 hasnot changed after the initial GPS fix), the processor 120 may determinethat the user is performing a stationary exercise, such as a treadmillrun or a stationary biking exercise. Accordingly, when the distancetravelled by the user is less than the distance threshold, the methodmay proceed to block 560 at which the processor 120 turns off ordecreases the resolution of the GPS receiver 166.

In another implementation, the processor 120 may determine that the userhas moved in response to detecting that the geolocation of the wearabledevice changing at a rate that is greater than a speed threshold. Thus,the method 500 may proceed to block 560 in response to the rate of thechange in geolocation of the wearable device 100 being greater than thespeed threshold. In one example, decision block 555 may be performedprior to or concurrently with the identification of the type of theexercise in block 515. For example, the processor 120 may identify thatthe type of the exercise is a non-stationary cycling-type exercise inresponse to (i) determining that the geolocation of the wearable device100 is changing at the rate greater than the speed threshold and/or (ii)determining that the output of the one or more biometric sensors iswithin at least one threshold range of a motion signature of acycling-type exercise.

Depending on the implementation, the defined time period since the startof the exercise used for the determination in decision block 520 may bedifferent for the classification of the exercise as discreet (e.g., atblock 550) than for the determination of whether the user has move sincethe start of the exercise (e.g., at decision block 555). For example,the defined time period for the method 500 proceeding to decision block555 may be less than the defined time period for proceeding to block550.

At decision block 565, the processor 120 may determine whether toperform additional operations. The method 500 may return to decisionblock 520 when the processor 120 determines to perform additionaloperations and may proceed to block 570 when the processor 120 hascompleted performing operations. The method 500 ends at block 570.

In some embodiments, the processor 120 may provide an on-device smartinteraction (e.g., via a user interface of the wearable device 100 orclient device 170) that enables the user to confirm that they are indeedexercising, or to specify that they are not exercising.

In some embodiments, the processor 120 may communicate with the user'ssmartphone and other sensors (foot pod, weight pod, etc.) in order toobtain further data (e.g., accelerometer data from the user'ssmartphone) to better identify and track the appropriate data forvarious exercise types.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may share a live statusand/or general location associated with the user's exercise activity(e.g., “John Smith is running in Lincoln Park”) via the user's socialgraph and/or the user's connections on an online social networkingservice (e.g., the Fitbit social graph, Facebook, LinkedIn, Twitter,Instagram, etc.). This may be beneficial for both safety reasons andsocial reasons.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may publish the exerciseand exercise details into an exercise challenge (e.g., Fitbit Challenge)that the user is participating in.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may track the user'sexercise progress against an exercise goal (e.g., an exercise goal basedon exercise frequency per week, or exercise duration per week, orexercise distance per week, or time in heart rate zone per week, orcalories burned per week, etc.). All or a subset of the weekly exercisegoal metrics could be updated based on the user's tracked exerciseprogress for all exercises in aggregate, or against specific exercisesthat the user has specified (e.g., via a user interface of the wearabledevice 100 or client device 170). For example, a triathlete could trackprogress against weekly goals for running, biking, and swimming.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may track the user'sexercise progress against a training plan. This feature would be forusers who have specified their intention (e.g., via a user interface ofthe wearable device 100 or client device 170) to participate in atraining plan that exists within the Fitbit user experience.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may (once the exercise iscompleted or mid-exercise) trigger achievement alerts for display on thewearable device 100 regarding exercise goals met or personal exerciseachievements earned (e.g., “Congrats, you have exercised 3 of 5 daysthis week!”).

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may trigger real-timecoaching for the user via the user interface of the wearable device 100(e.g., based on the type of exercise). This feature may be triggered forspecific exercises for users who have specified (e.g., via a userinterface of the wearable device 100 or client device 170) that theywould like to receive coaching for specific exercises.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may turn on music from aBluetooth connected headset or mobile phone connected via a network tothe wearable device 100. The processor 120 may stop the music when theprocessor 120 automatically detects the end of the exercise.

In some embodiments, after the processor 120 automatically determinesthat the user is exercising, the processor 120 may play music (e.g., onthe wearable device 100, a mobile phone connected via a network to thewearable device 100, or other music/media system connected via a networkto the wearable device 100 and/or the mobile phone) based on the type ofthe exercise or based on the detected current location of the user.Examples include a playlist for gyms, a playlist for bootcamp, aplaylist for the track, etc.

In some embodiments, once a user starts exercising, there may be somelag before the exercise is automatically detected (and the appropriateexercise-related algorithms are activated). During this period, exerciserelevant data such as high resolution heart rate data and accuratecalorie burn data can be estimated by using all day activity datalogging (e.g., heart rate data and calorie burn data collected on thecurrent day but before the user started exercising).

Back-Filling of Exercise Route(s)

Certain aspects of this disclosure relate to the back-filling ofexercise routes that may not otherwise include complete geolocation datafrom the start of the exercise. As described above, a user of a wearabledevice 100 may start or initiate an exercise prior to a GPS receiver 166(included in the wearable device 100 or the client device 170 that ispaired with the wearable device 100) obtaining a GPS fix. For example,the user may select a “quick start” exercise, including the manual startof an exercise prior to obtaining a GPS fix. In another example, theuser may start an exercise without manually inputting an indication ofthe start of the exercise. In this situation, the wearable device 100may automatically detect the start of the exercise and turn on orincrease the resolution of a GPS receiver 166, as discussed above.Accordingly, in certain circumstances, the user may start an exercisebefore the GPS receiver 166 is able to get a fix of the geolocation ofthe user.

When the user has started an exercise without a GPS fix, the GPSreceiver 166 may obtain a GPS fix at a point in time after the start ofthe exercise. Thus, GPS receiver 166 may be able to log geolocation datafor a portion of the exercise after the initial GPS fix, but geolocationdata related to an initial period of the exercise before the GPS fix maynot be available. As such, certain aspects of this disclosure relate tothe estimation of a route of the exercise prior to an initial GPS fixsuch that a route of substantially the entire exercise may be storedand/or displayed to the user. For example, the visualization of outdoorexercises, such as, for example, running or biking, may be provided to auser via the display of an exercise route on the wearable device oranother device such as, for example, a connected mobile device or acomputer. Of course, those skilled in the art would realize that similardelays in an initial geolocation fix may be present in other geolocationsensor(s) 167, and thus, the user may start an exercise prior to the ageolocation sensor obtaining an initial geolocation fix.

FIG. 6 is a flowchart illustrating a method for the back-filling ofexercise routes in accordance with aspects of this disclosure. Themethod 600 may be operable by a wearable device 100, or component(s)thereof, for automatic detection of exercises in accordance with aspectsof this disclosure. For example, the steps of method 600 illustrated inFIG. 6 may be performed by a processor 120 of the wearable device 100.In another example, a client device 170 (e.g., a mobile phone) or aserver 175 in communication with the wearable device 100 may perform atleast some of the steps of the method 600. For convenience, the method600 is described as performed by the processor 120 of the wearabledevice 100.

The method 600 starts at block 601. At block 605, the processor 120determines that a user of the wearable device 100 has started anexercise. This determination may be performed manually (e.g., the userinputs an indication of the start of an exercise via, for example, aquick start input) or automatically (e.g., the wearable device 100automatically detects the start of the exercise based on data receivedfrom biometric sensor(s) 160 as described above with reference to FIGS.4 and 5).

At block 610, the processor 120 activates the GPS receiver 166 (and/orthe other geolocation sensor(s) 167). The GPS receiver 166 may take aperiod of time in order to obtain an initial GPS fix. As discussedabove, the amount of time required for the GPS receiver 166 to obtainthe initial GPS fix may vary depending on whether the GPS receiver 166was inactive (e.g., turned off) or running at a low resolution. At block615, the processor detects the time at which the GPS receiver 166achieves an initial GPS fix. At block 620, the processor determines afirst data set relating to at least one of the distance, direction, andspeed of the user during a first time interval. The first time intervalmay be the time interval between the start of the exercise and theinitial GPS fix. Depending on the implementation, the processor 120 mayperform block 620 prior to or concurrently with blocks 610 and/or 615.

At block 625, the processor 120 may back-fill the exercise route duringthe first time interval based at least in part on the first data set.The back-filling of the exercise route may include, for example,estimating the location of the user at various points in time during thefirst time interval based on one or more of the determined distance,direction, and speed of the user during the first time interval. Themethod 600 ends at block 630.

Another implementation of the back-filling of exercise routes isillustrated in FIG. 7. FIG. 7 is a flowchart illustrating another methodfor the back-filling of exercise routes in accordance with aspects ofthis disclosure. The method 700 may be operable by a wearable device100, or component(s) thereof, for automatic detection of exercises inaccordance with aspects of this disclosure. For example, the steps ofmethod 700 illustrated in FIG. 7 may be performed by a processor 120 ofthe wearable device 100. In another example, a client device 170 (e.g.,a mobile phone) or a server 175 in communication with the wearabledevice 100 may perform at least some of the steps of the method 700. Forconvenience, the method 700 is described as performed by the processor120 of the wearable device 100.

The method 700 begins at block 701. At block 705, the processor 120 mayoptionally log an approximate location of the user. For example, theprocessor 120 may log geolocation data received from the GPS receiver166 at a low frequency (e.g., a frequency lower than an exercisefrequency used to log GPS geolocation data during an exercise). In thealternative, or in addition, the processor 120 may log geolocation datareceived from the other geolocation sensor(s) 167 (e.g., WWAN and/orWLAN radio component(s) in the wearable device 100 and/or the clientdevice 170). The logged geolocation data may be used by the GPS receiver166 to reduce the time required to obtain a first GPS fix. The processor120, and/or a processor included in the GPS receiver 166, may be able toachieve a quicker GPS fix by having location information of the wearabledevice 100 estimated from the logged geolocation data. For example, GPSfix may be determined by searching a “search space” until the locationof the GPS receiver 166 is determined. The location of the GPS receiver166 may be estimated based on the logged geolocation data. The processor120, and/or a processor included in the GPS receiver 166, may use theestimated location to reduce the search space, thereby reducing theamount of time to achieve the GPS fix. The logging of GPS data describedin connection with FIG. 7 may also be used in combination with otherimplementations, e.g., the implementation of FIG. 5, in order to reducethe time to an initial GPS fix.

At block 710, the processor 120 determines that a user of the wearabledevice 100 has started an exercise. This determination may be performedmanually (e.g., the user inputs an indication of the start of anexercise via, for example, a quick start input) or automatically (e.g.,the wearable device 100 automatically detects the start of the exercisebased on data received from biometric sensor(s) 160). At block 715, theprocessor 120 activates the GPS receiver 166. The activation of the GPSreceiver 166 may include turning on the GPS receiver 166 or increasingthe resolution of the GPS receiver 166. The GPS receiver 166 may take aperiod of time in order to obtain an initial GPS fix. As discussedabove, the amount of time required for the GPS receiver 166 to obtainthe initial GPS fix may vary depending on whether the GPS receiver 166was inactive (e.g., turned off) or running at a low resolution. At block720, the processor detects the time at which the GPS receiver 166achieves an initial GPS fix.

At block 725, the processor 120 determines a first data set (alsoreferred to herein as a first set of user data) relating to at least oneof the distance, direction, and speed of the user during a first timeinterval. The first time interval may be the time interval between thestart of the exercise and the initial GPS fix. Depending on theimplementation, the processor 120 may perform block 725 prior to orconcurrently with blocks 715 and/or 720. In certain implementations, theprocessor 120 may log data from one or more biometric sensor(s) 160 fromwhich the first data may be determined. In one implementation, thelogging of the first set of user data may include determining one ormore direction vectors representative of the user's movement during thefirst time interval based on output of the one or more biometricsensor(s) 160, such as one or more direction sensors 163 (e.g.,gyroscope, magnetometer, etc.). The direction vectors may be indicativeof the exercise route during the first time interval.

For example, after block 725, the method 700 may then proceed to one ofblocks 730, 740, 750, 755, and 765. At block 730, the processor 120determines a second set of data relating to the position of the userduring a second time interval. The second time interval may begin afterthe time at which the GPS receiver 166 obtains the initial GPS fix. Thesecond set of data may be geolocation data received from the GPSreceiver 166. In certain implementations, the second set of data may belogged based on position data received from the GPS receiver 166 duringthe second time interval.

In certain implementations, a first set of direction vectors may bedetermined during the first time interval and a second set of directionvectors may be determined during the second time interval. The seconddirection vectors may be used by the processor 120 in determining thefirst direction vectors. For example, the second direction vectors mayindicate that the user performed the exercise in a substantiallystraight line. In this case, the processor 120 may determine that theuser did not make any substantial changes in direction during the firsttime period based on the determination that the user performed theexercise in a substantially straight line during the second time period.The processor 120 may further determine that the user changed thedirection of the route during the first time period in response to theoutput of the one or more biometric sensor(s) 160 being indicative of achange in direction with a corresponding confidence level that isgreater than a threshold confidence level. Similarly, if the processor120 determines that the second direction vectors are consistent with theuser performing the exercise in a loop, the processor 120 may supplementthe first direction vectors such that the first direction vectors areconsistent with the loop identified by the second direction vectors.

At block 735, the processor 120 may calibrate the first set of databased on the second set of data. For example, the first set of data mayinclude data that is estimated based on output receiver from theaccelerometer 162, the optical sensor(s) 168, and/or the other biometricsensor(s) 164. Accordingly, the first set of data may include indirectestimations of the distance, direction, and speed of the user. In thealternative, or in addition, the first set of user data may include oneor more of step count, step rate, stride length, cadence, and adistance-to-cadence ratio for the user. For example, for a runningexercise, distance may be estimated based on a step count determinedfrom data received from the accelerometer 162. For example, the distanceestimation may be based on a stride length of the user multiplied by thedetermined step count. In some embodiment, the stride length may beinput by a user of the wearable device 100, or may be calculated basedon a height and/or weight input by the user of the wearable device 100in conjunction with one or more stride length algorithms and/orformulas, or may be determined based on demographic informationcorresponding to a user of the wearable device 100, and so on. However,a user's stride length may vary based on factors such as the user'senergy level, the grade or quality of the terrain, etc. Accordingly, theestimated distance may vary based on the difference between theestimated stride length and the user's actual stride length. In oneimplementation, the stride length of the user may be calibrated based onthe second set of data (e.g., the geolocation data received from the GPSreceiver 166 may indicate a given distance traversed by the user, andthe given distance may be divided by a number of detected steps taken totraverse the given distance, to thereby produce the calibrated stridelength). Since the stride length calibrated based on the GPS geolocationdata may be more accurate than the initial estimated stride length, bycalibrating the stride length, the estimated distance during the firsttime period may be improved. Similar calibrations for other measurementdata during the first time period may also be performed.

For example, after block 735, the method 700 may proceed to one ofblocks 740, 750, 755, and 765. At block 740, the processor 120determines and stores a start location of the exercise in the memory130. For example, when time of the initial GPS fix is substantially thesame as the time at which the user has started an exercise (e.g., withina threshold time difference), the processor 120 may determine thelocation of the start of the exercise as the location of the initial GPSfix. The processor 120 may store the start location in the memory 130 asa potential start location for future exercises.

At block 745, the processor may analyze a plurality of previously storedstart locations to identify candidate start location(s) for futureexercises. For example, when a plurality of stored start locations areclustered (e.g., within a threshold distance from each other), the usermay have a history of starting exercises at the clustered startlocation. The processor 120 or the server may refine the stored startlocations via clustering the stored start locations to identifylocations at which the user has started exercises a plurality of times.In one implementation, clustering of the start locations may include ahierarchical clustering method to group nearby starting locations. Oneexemplary hierarchical clustering method is a bottom up agglomerativeclustering, which computes the closest two start locations and mergesthe two closest start locations together by replacing the two closeststart locations with, e.g., their mid-point start location. This bottomup agglomerative clustering of the two closest start locations maycontinue until each of the stored start locations is spaced apart fromthe closest neighboring start location by more than a thresholddistance. Each of the final start locations may represent a group ofcandidate start locations. Accordingly, the processor 120 may identify astart location that represents the clustered start locations as acandidate start location for the back-filling of exercises.

At block 750, the processor 120 may optionally receive candidate startlocations from a user and store the candidate start locations in thememory 130. For example, the processor 120 may prompt the user to acceptor decline the candidate start location identified in step 745 for useas a candidate start location for back-filling of exercise route(s). Inanother implementation, the user may manually select locations ascandidate start locations for exercise route back-filling (e.g., via auser interface of the wearable device 100 or client device 170). Themanual selection of locations as candidate start locations may beperformed prior to the start of method 700 (e.g., block 750 may beperformed prior to block 705) when the user is not performing anexercise.

At block 755, the processor 120 may retrieve one or more candidate startlocations from the memory 130. At block 760, the processor 120 mayidentify one of the candidate start locations as a start location of theexercise. For example, the processor 120 may determine that one of thecandidate start locations is within a defined distance from the locationof the initial GPS fix. The processor 120 may also select one of thecandidate start locations based on the first data set. For example, whenthe first data set is indicative of a distance and direction of theexercise prior to the initial GPS fix, the processor 120 may estimate astart location of the exercise based on the first set of user data anddetermine that one of the candidate start locations that is within adefined distance from the estimated start location. The processor 120may select the candidate start location that is within a defineddistance from the estimated start location as a start location of theexercise.

At block 765, the processor 120 may back-fill the exercise route duringthe first time interval based at least in part on the first data set.When a candidate start location has not been identified, the processor120 may back-fill the route based on the first data set without apredetermined start location. However, when a candidate start locationhas been identified as the start location of the exercise, the processor120 may back-fill the route from the initial location of the GPS fix tothe start location identified in block 760. The processor 120 mayreconstruct the exercise route based on an estimation of the location ofthe user at various points in time during the first time interval. Thedistance, direction, and/or speed of the user during the first timeinterval may be indicative of an approximate location of the user duringthe first time interval. Further, the back-filling of the exercise routemay be further based on the second set of user data (e.g., determinedand/or logged at block 730) (e.g., via calibrating the first set of userdata based on the second set of user data, via aggregating the first andsecond sets of user data and back-filling the exercise route based onthe aggregated set of user data, and/or via a combination of calibratingand user data aggregation). The method ends at block 770.

In addition to the back-filling of the route, the processor 120 may alsouse the identified start location to improve estimates of other metricsduring the first time interval. For example, distance, speed, and routemap estimate may be more accurately calculated by the processor 120 oncethe start location has been identified since the boundaries of theexercise route can be identified. Thus, the user may be able to viewmore accurate metrics associated with the exercise in “real-time” duringthe exercise rather than waiting for updated metrics to be calculated bya client device 170 or server 175 after the exercise have been completedand the user has manually correct the route of the exercise.

In some implementations, the back-filled route data may also be used bythe processor 120 to supplement and/or verify biometric data receivedfrom the biometric sensor(s) 160. For example, the back-filled routeinformation may indicate that the user has travelled over a hill duringthe exercise. The processor 120 may be able to retrieve the elevationgains and/or losses expected for the route taken by the user from a mapdatabase. This elevation information may be used by the processor 120 toverify and/or supplement the data received from an altimeter.Accordingly, the processor 120 may be able to use additional geolocationdata associated with the back-filled route in order to supplement and/orverify the data received from other biometric sensor(s) 160.

Certain aspects of the techniques for automatic detection of exercisesmay be employed for the back-filling of GPS exercise routes, andvice-versa. For example, the type of the exercise determined in block515 in FIG. 5 may be used in certain implementations of the exerciseroute back-filling techniques.

As discussed above, the type of the exercise may be identified based oncomparing the output of one or more biometric sensor(s) to define sensordata for a plurality of exercise types. The identified type of exercisemay be used by the processor 120 to determine a rate of periodicmovement (e.g., the frequency at which certain metrics associated with aspecific exercise are repeated) of the exercise during the first timeinterval. For example, when the user is running, the rate of periodicmovement may be a pace of the user, and when the user is biking, therate of periodic movement may be a cadence of the user. The processor120 may then determine a rate of distance travelled based on the rate ofperiodic movement and the type of the exerciser (e.g., the stride lengthof the user or current gear ratio of the user's bike). The processor 120may determine a distance that the user has traveled during the firsttime interval based on the rate of periodic movement and the rate ofdistance traveled. The distance that the use has travelled may be usedby the processor 120 in back-filling the route of the exercise. As such,the type of the exercise may be employed in certain implementations ofthe exercise route back-filling techniques described herein. Thoseskilled in the art would recognize that other combinations of variouselements between the automatic exercise detection techniques, theautomatic tracking or location information for the detected exercise,and the exercise route back-filling techniques may be possible.

FIG. 8 is a block diagram illustrating an example implementation of theback-filling of an exercise route in accordance with aspects of thisdisclosure. Specifically, FIG. 8 illustrates a map including 6×4 cityblocks. In the implementation of FIG. 8, the memory includes a pluralityof candidate start locations 805, 810, and 815 stored therein. Duringthe illustrated exercise, the user of the wearable device 100 begins anexercise near the candidate start location 810. The processor 120 of thewearable device 100 detects that the user has started the exercise(e.g., via a user input or automatically based on data received from oneor more of the biometric sensor(s) 160). In response to detecting thatthe user has started the exercise, the processor 120 activates ageolocation sensor (e.g., the GPS receiver 166).

The processor 120 logs a first set of user data relating to at least oneof distance, direction, and speed of the user during a first timeinterval. The first time interval may be the interval between the startof the exercise and a detected time of an initial location fix at point825 (e.g., GPS fix). After the GPS fix at point 825, the processor 120may log location information received from the geolocation sensor, whichis indicated by the solid line 830. This logging of geolocation data maycontinue for a second time interval until the processor 120 detects theend of the exercise (e.g., via user input or the automatic detection ofthe end of the exercise) at the end point 840.

The processor 120 may back-fill the exercise either after the end of theexercise or concurrently with the exercise. For example, the processor120 may estimate the exercise route 820 of the user during the firstinterval based on the first user data. When the processor 120 determinesthat the estimated route of the exercise is within a threshold distancefrom one of the stored candidate start locations (e.g., the candidatestart location 810 in the illustrated example), the processor 120 mayback-fill the route to the determined candidate start location. Theback-filled route may thus include both the back-filled portion 820 andthe GPS-generated portion 830 as an indication of the route travelled bythe user during the exercise.

In some embodiments, the processor 120 may determine a second set ofuser data during a second time interval (e.g., GPS position, speed, anddirection/heading based on multiple subsequent GPS fixes after aninitial GPS fix), and combine that with a first set of user dataregarding any detected turns (e.g., detected via directional sensorslike gyroscopes and magnetometers) in a first time interval before theinitial GPS fix, to thereby backtrack and determine the user'sdirection/heading throughout the first time interval (and ultimatelywhere the user started the exercise). For example, if the second set ofuser data indicates the user is moving in a straight line heading east,and no turns were detected in the first time interval, then theprocessor 120 may infer that user was moving on that same line headingeast throughout the first time interval. As another example, if thesecond set of user data indicates the user is moving in a straight lineheading east, and one 90 degree right turn was detected in the firsttime interval, then the processor 120 may infer that user was initiallymoving north and then turned east during the first time interval. Thus,the processor 120 may utilize second time interval data (e.g., GPS-basedheading data) to infer heading during the first time interval.

Further Example Flowchart for Automatic Detection of Exercise(s) andTracking of Geolocation Data

FIG. 9 is a flowchart illustrating another example method operable by awearable device 100, or component(s) thereof, for automatic detection ofexercise(s) and tracking of geolocation data in accordance with aspectsof this disclosure. For example, the steps of method 900 illustrated inFIG. 9 may be performed by a processor 120 of the wearable device 100.In another example, a client device 170 (e.g., a mobile phone) or aserver 175 in communication with the wearable device 100 may perform atleast some of the steps of the method 900. For convenience, the method900 is described as performed by the processor 120 of the wearabledevice 100.

In one implementation, the wearable device 100 comprises one or morebiometric sensors, a GPS receiver 166, and the processor 120. The method900 begins at block 901. At block 905, the processor 120 determines,based on output of the one or more biometric sensors, that a user of thewearable device 100 has started an exercise. At block 910, the processor120 identifies a type of the exercise that the user has started based oncomparing the output of the one or more biometric sensors to definedsensor data for a plurality of exercise types. At block 915, theprocessor 120 adjusts the GPS receiver 166 in response to determiningthe start of the exercise and based on the type of the exercise.

In one implementation, after block 915, the method may involve, at block920, the processor 120 calculating, based on the type of the exerciseand positioned data logged by the adjusted GPS receiver 166, at leastone of (i) a speed of the user, and (ii) a distance travelled by theuser during the exercise. The method 900 ends at block 925.

Further Example Flowchart for Back-Filling of Geolocation-Based ExerciseRoute(s)

FIG. 10 is a flowchart illustrating another example method operable by awearable device 100, or component(s) thereof, for back-filling ofgeolocation-based exercise route(s) in accordance with aspects of thisdisclosure. For example, the steps of method 1000 illustrated in FIG. 10may be performed by a processor 120 of the wearable device 100. Inanother example, a client device 170 (e.g., a mobile phone) or a server175 in communication with the wearable device 100 may perform at leastsome of the steps of the method 1000. For convenience, the method 1000is described as performed by the processor 120 of the wearable device100.

In one implementation, the wearable device 100 comprises one or morebiometric sensor(s) 160, a geolocation sensor (e.g., a GPS receiver166), and the processor 120. The method 1000 begins at block 1001. Atblock 1005, the processor 120 determines that a user of the wearabledevice has started an exercise. At block 1010, the processor 120activates the geolocation sensor in response to determining that theuser has started the exercise. At block 1015, the processor 120 detectsa time at which the geolocation sensor achieves an initial fix of ageolocation of the wearable device 100. At block 1020, the processor 120logs, based on output of the one or more biometric sensors, a first setof user data relating to at least one of distance, direction, and speedof the user during a first time interval between the start of theexercise and the detected time of the initial fix. At block 1025, theprocessor 120 back-fills an exercise route of the user during the firsttime interval based on the first set of user data. The method 900 endsat block 1030.

Other Considerations

Information and signals disclosed herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative logical blocks, and algorithm steps describedin connection with the embodiments disclosed herein may be implementedas electronic hardware, computer software, or combinations of both. Toclearly illustrate this interchangeability of hardware and software,various illustrative components, blocks, and steps have been describedabove generally in terms of their functionality. Whether suchfunctionality is implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem. Skilled artisans may implement the described functionality invarying ways for each particular application, but such implementationdecisions should not be interpreted as causing a departure from thescope of the present disclosure.

The techniques described herein may be implemented in hardware,software, firmware, or any combination thereof. Such techniques may beimplemented in any of a variety of devices, such as, for example,wearable devices, wireless communication device handsets, or integratedcircuit devices for wearable devices, wireless communication devicehandsets, and other devices. Any features described as devices orcomponents may be implemented together in an integrated logic device orseparately as discrete but interoperable logic devices. If implementedin software, the techniques may be realized at least in part by acomputer-readable data storage medium comprising program code includinginstructions that, when executed, performs one or more of the methodsdescribed above. The computer-readable data storage medium may form partof a computer program product, which may include packaging materials.The computer-readable medium may comprise memory or data storage media,such as random access memory (RAM) such as synchronous dynamic randomaccess memory (SDRAM), read-only memory (ROM), non-volatile randomaccess memory (NVRAM), electrically erasable programmable read-onlymemory (EEPROM), FLASH memory, magnetic or optical data storage media,and the like. The techniques additionally, or alternatively, may berealized at least in part by a computer-readable communication mediumthat carries or communicates program code in the form of instructions ordata structures and that can be accessed, read, and/or executed by acomputer, such as propagated signals or waves.

Processor(s) in communication with (e.g., operating in collaborationwith) the computer-readable medium (e.g., memory or other data storagedevice) may execute instructions of the program code, and may includeone or more processors, such as one or more digital signal processors(DSPs), general purpose microprocessors, ASICs, field programmable logicarrays (FPGAs), or other equivalent integrated or discrete logiccircuitry. Such a processor may be configured to perform any of thetechniques described in this disclosure. A general purpose processor maybe a microprocessor; but in the alternative, the processor may be anyconventional processor, controller, microcontroller, or state machine. Aprocessor may also be implemented as a combination of computing devices,for example, a combination of a DSP and a microprocessor, a plurality ofmicroprocessors, one or more microprocessors in conjunction with a DSPcore, or any other such configuration. Accordingly, the term“processor,” as used herein may refer to any of the foregoing structure,any combination of the foregoing structure, or any other structure orapparatus suitable for implementation of the techniques describedherein. Also, the techniques could be fully implemented in one or morecircuits or logic elements.

The techniques of this disclosure may be implemented in a wide varietyof devices or apparatuses, including a wearable device, a wirelesshandset, an integrated circuit (IC) or a set of ICs (e.g., a chip set).Various components, or units are described in this disclosure toemphasize functional aspects of devices configured to perform thedisclosed techniques, but do not necessarily require realization bydifferent hardware units. Rather, as described above, various units maybe combined in a hardware unit or provided by a collection ofinter-operative hardware units, including one or more processors asdescribed above, in conjunction with suitable software and/or firmware.

Although the foregoing has been described in connection with variousdifferent embodiments, features or elements from one embodiment may becombined with other embodiments without departing from the teachings ofthis disclosure. However, the combinations of features between therespective embodiments are not necessarily limited thereto. Variousembodiments of the disclosure have been described. These and otherembodiments are within the scope of the following claims.

What is claimed is:
 1. A wearable device for automatically tracking an exercise, comprising: one or more biometric sensors; a wireless transceiver configured to communicate with a mobile device; a touch screen display configured to display exercise metrics based on biometric data output from the one or more biometric sensors and receive touch input; at least one processor coupled to the one or more biometric sensors, the wireless transceiver, and the touch screen display; and a memory storing computer-executable instructions for controlling the at least one processor to: determine, based on the biometric data output from the one or more biometric sensors, that a user of the wearable device has started an exercise, display, via the touch screen display, an indication that the user has started the exercise, receive, from the touch screen display, a touch input confirmation that the user has started the exercise, and determine, based on the biometric data output from the one or more biometric sensors, that a user of the wearable device has ended the exercise.
 2. The wearable device of claim 1, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: store at least a portion the biometric data related to the exercise in response to determining that the user has started the exercise, and end storage of the portion of the biometric data related the exercise in response to determining that the user has ended the exercise.
 3. The wearable device of claim 2, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: classify the exercise as a discrete exercise separate from other activity data in response to the touch input confirmation, and associate the stored portion of the biometric data related to the exercise with the discrete exercise.
 4. The wearable device of claim 3, wherein the storing of the portion the biometric data related to the exercise is performed before receiving the touch input confirmation.
 5. The wearable device of claim 2, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: receive, from the touch screen display, an indication that the user has not started the exercise, and refrain from associating the stored portion of the biometric data with a discrete exercise.
 6. The wearable device of claim 1, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: adjust a resolution of at least one of the one or more biometric sensors in response to determining that the user has started the exercise.
 7. The wearable device of claim 1, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: identify a type of the exercise based on comparing the biometric data to defined sensor data for a plurality of exercise types in response to determining that the user has started the exercise.
 8. The wearable device of claim 6, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: select an exercise-related application based on the type of the exercise, and launch the selected exercise-related application.
 9. The wearable device of claim 1, further comprising: a global positioning system (GPS) receiver, wherein the memory further comprises computer-executable instructions for controlling the at least one processor to: adjust the GPS receiver in response to determining that the user has started the exercise.
 10. The wearable device of claim 9, wherein the computer-executable instructions for adjusting the GPS receiver cause the at least one processor to: identify a type of the exercise based on comparing the biometric data to defined sensor data for a plurality of exercise types in response to determining that the user has started the exercise, turn on the GPS receiver based on the type of the exercise, and store position data based on geolocation data received from the GPS receiver.
 11. A biometric tracking device, comprising: one or more biometric sensors; a touch screen display configured to display exercise metrics based on biometric data output from the one or more biometric sensors; at least one processor coupled to the one or more biometric sensors, the wireless transceiver, and the touch screen display; and a memory storing computer-executable instructions for controlling the at least one processor to: determine, based on the biometric data output from the one or more biometric sensors, that a user of the wearable device has started an exercise; display, via the touch screen display, an indication that the user has started the exercise; receive, from the touch screen display, a touch input confirmation that the user has started the exercise; and determine, based on the biometric data output from the one or more biometric sensors, that a user of the wearable device has ended the exercise.
 12. The biometric tracking device of claim 11, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: store at least a portion the biometric data related to the exercise in response to determining that the user has started the exercise, and end storage of the portion of the biometric data related the exercise in response to determining that the user has ended the exercise.
 13. The biometric tracking device of claim 12, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: classify the exercise as a discrete exercise separate from other activity data in response to the touch input confirmation, and associate the stored portion of the biometric data related to the exercise with the discrete exercise.
 14. The biometric tracking device of claim 13, wherein the storing of the portion the biometric data related to the exercise is performed before receiving the touch input confirmation.
 15. The biometric tracking device of claim 12, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: receive, from the touch screen display, an indication that the user has not started the exercise, and refrain from associating the stored portion of the biometric data with a discrete exercise.
 16. The biometric tracking device of claim 11, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: adjust a resolution of at least one of the one or more biometric sensors in response to determining that the user has started the exercise.
 17. The biometric tracking device of claim 11, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: identify a type of the exercise based on comparing the biometric data to defined sensor data for a plurality of exercise types in response to determining that the user has started the exercise.
 18. The biometric tracking device of claim 16, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: select an exercise-related application based on the type of the exercise, and launch the selected exercise-related application.
 19. The biometric tracking device of claim 11, further comprising: a global positioning system (GPS) receiver, wherein the memory further stores computer-executable instructions for controlling the at least one processor to: adjust the GPS receiver in response to determining that the user has started the exercise.
 20. The biometric tracking device of claim 19, wherein the computer-executable instructions for adjusting the GPS receiver cause the at least one processor to: identify a type of the exercise based on comparing the biometric data to defined sensor data for a plurality of exercise types in response to determining that the user has started the exercise, turn on the GPS receiver based on the type of the exercise, and store position data based on geolocation data received from the GPS receiver.
 21. A method of operating a wearable device, the wearable device comprising one or more biometric sensors, a touch screen display configured to display exercise metrics based on biometric data output from the one or more biometric sensors, and at least one processor, the method comprising: determining, based on the biometric data output from the one or more biometric sensors, that a user of the wearable device has started an exercise, displaying, via the touch screen display, an indication that the user has started the exercise, receiving, from the touch screen display, a touch input confirmation that the user has started the exercise, and determining, based on the biometric data output from the one or more biometric sensors, that a user of the wearable device has ended the exercise.
 22. The method of claim 21, further comprising: storing at least a portion the biometric data related to the exercise in response to determining that the user has started the exercise, and ending storage of the portion of the biometric data related the exercise in response to determining that the user has ended the exercise.
 23. The method of claim 22, further comprising: classifying the exercise as a discrete exercise separate from other activity data in response to the touch input confirmation, and associating the stored portion of the biometric data related to the exercise with the discrete exercise.
 24. The method of claim 23, wherein the storing of the portion the biometric data related to the exercise is performed before receiving the touch input confirmation.
 25. The method of claim 22, further comprising: receiving, from the touch screen display, an indication that the user has not started the exercise, and refraining from associating the stored portion of the biometric data with a discrete exercise.
 26. The method of claim 21, further comprising: adjusting a resolution of at least one of the one or more biometric sensors in response to determining that the user has started the exercise.
 27. The method of claim 21, further comprising: identifying a type of the exercise based on comparing the biometric data to defined sensor data for a plurality of exercise types in response to determining that the user has started the exercise.
 28. The method of claim 26, further comprising: selecting an exercise-related application based on the type of the exercise, and launching the selected exercise-related application.
 29. The method of claim 21, wherein: the wearable device further comprises a global positioning system (GPS) receiver, and the method further comprises: adjusting the GPS receiver in response to determining that the user has started the exercise.
 30. The method of claim 21, wherein adjusting the GPS receiver comprises: identifying a type of the exercise based on comparing the biometric data to defined sensor data for a plurality of exercise types in response to determining that the user has started the exercise, turning on the GPS receiver based on the type of the exercise, and storing position data based on geolocation data received from the GPS receiver. 